Calumetite
A variety of Minerals
What is Calumetite?
Calumetite is a natural rarely occurring mineral. It was discovered in 1963 at the Centennial Mine near Calumet, Michigan, United States. Calumetite was first discovered along with anthonyite. It has a chemical formula of Cu(OH,Cl)2•2(H2O).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Calumetite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Calumetite Localities Map
See where Calumetite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Calumetite
Calumetite occurs as a brilliant azure to powder blue mineral. It has a hardness of 2 with good cleavage along the {001} direction and belongs to the orthorhombic crystal system. Calumetite has a bluish-white streak. Its luster is pearly on cleavage. Calumetite has a brittle tenacity and is semitransparent. The specific gravity of calumetite could not be measured because of the difficulty in separating the quartz and epidote from the calumetite mineral coating them.
Quick Facts
Physical Properties
- Color
- Azure blue; Powder blue
- Hardness (Mohs)
- 2
Chemical Properties
- Chemical Formula
- CaCu4(OH)8Cl2·3.5H2O
- Elements
- Ca, Cl, Cu, H, O
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Calumetite FAQs
How do I identify Calumetite?
Calumetite can be identified by its hardness of 2 on the Mohs scale, Azure blue; Powder blue color. Look for these key characteristics when examining specimens.
What color is Calumetite?
Calumetite typically appears in Azure blue; Powder blue. Color can vary depending on impurities and formation conditions.
How hard is Calumetite?
Calumetite has a hardness of 2 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the characteristics of calumetite of Calumetite?
Calumetite occurs as a brilliant azure to powder blue mineral. It has a hardness of 2 with good cleavage along the {001} direction and belongs to the orthorhombic crystal system. Calumetite has a bluish-white streak. Its luster is pearly on cleavage. Calumetite has a brittle tenacity and is semitransparent. The specific gravity of calumetite could not be measured because of the difficulty in separating the quartz and epidote from the calumetite mineral coating them.
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